Variable force electromagnetic shutter

Details Variable force electromagnetic shutter Variable force electromagnetic shutter

1981-12-22

1983-11-29

Mathews, A. A.

354246, G03B 908

Patent

active

044177976

ABSTRACT:
In the disclosed focal plane shutter, desired travelling characteristics of shutter curtains are obtained by adjusting the distribution of magnetic flux density between the permanent magnet and the coil which constitute an electromagnetic drive source. Preferably, the flux density is arranged to be a maximum closer to the start position than the end position.

REFERENCES:
patent: 4268153 (1981-05-01), Sugiura et al.
patent: 4338013 (1982-07-01), Shimada et al.

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